body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 2rem;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    color: #495057;
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 600;
}

#file-input {
    width: 100%;
    padding: 1rem;
    border: 2px dashed #ced4da;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

#file-input:hover {
    border-color: #0d6efd;
    background: rgba(13, 110, 253, 0.05);
}

#upload-btn {
    width: 100%;
    padding: 1rem;
    background: #0d6efd;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
}

#upload-btn:hover {
    background: #0b5ed7;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: #e9ecef;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

#progress {
    height: 100%;
    background: linear-gradient(90deg, #0d6efd, #0b5ed7);
    width: 0;
    transition: width 0.3s ease;
}

#status {
    text-align: center;
    color: #6c757d;
    margin: 1rem 0;
    font-size: 0.9rem;
}

#md5-progress {
    text-align: center;
    color: #6c757d;
    font-size: 0.8rem;
    margin-top: 1rem;
}